Characterization of directly acting mutagens produced from N-nitroso-N-(formylmethyl)alkylamines: Their possible involvement in the carcinogenesis of N-nitrosamines having a 2-hydroxyethyl group.
OKADA MASASHI; SUZUKI EMAKO; IIYOSHI MINORU, CHEM. AND PHARM. BULL., 1978, 26, NO 12, 3891-3896
作者:OKADA MASASHI、 SUZUKI EMAKO、 IIYOSHI MINORU
DOI:——
日期:——
Syntheses of N-alkyl-N-(hydroxy- or oxo-alkyl)nitrosamines related to N-butyl-N-(4-hydroxybutyl)nitroamine, a potent bladder carcinogen.
作者:MASASHI OKADA、EMAKO SUZUKI、MINORU IIYOSHI
DOI:10.1248/cpb.26.3891
日期:——
Nineteen N-alkyl-N-(hydroxy- or oxo-alkyl) nitrosamines structurally related to N-butyl-N-(4-hydroxybutyl) nitrosamine, a potent bladder carcinogen, were synthesized for the purpose of investigating their carcinogenic effects in rats. They are N-alkyl-N-(4-hydroxybutyl) nitrosamines, N-alkyl-(3-hydroxypropyl)-nitrosamines, N-alkyl-N-(2-hydroxyalkyl) nitrosamines, and N-alkyl-N-(2- or 3-oxoalkyl) nitrosamines. They were mostly prepared by the nitrosation of the corresponding N-alkyl-N-(hydroxyalkyl) amines. The nitrosamines with an oxo group were prepared by chromium trioxide oxidation of the corresponding N-alkyl-N-(hydroxyalkyl) nitrosamines with a secondary hydroxyl group.
Characterization of directly acting mutagens produced from N-nitroso-N-(formylmethyl)alkylamines: Their possible involvement in the carcinogenesis of N-nitrosamines having a 2-hydroxyethyl group.
Directly acting mutagens formed from N-nitroso-N- (formylmethyl) alkylamines (3) were isolated and identified as N-nitroso-N-alkyl-1-hydroxyimino-2-oxoethylamines (4). Their structures were elucidated on the basis of nuclear magnetic resonance spectra and confirmed by derivatization to the crystalline 2, 4-dinitrophenylhydrazones (5). Compounds 4 (alkyl =ethyl and butyl) were strongly mutagenic to Salmonella typhimurium TA 1535 and Escherichia coli WP2 hcr- without metabolic activation, while 4 with a tert-butyl group was not mutagenic. The formation of 4 is considered to proceed by the nitrosation of 3, indicating a possible involvement of the formylmethyl metabolite in carcinogenesis by N-nitrosamines with a 2-hydroxyethyl group.